Answer: B.
Explanation:
When the electron changes levels, it decreases energy and the atom emits photons. The photon is emitted with the electron moving from a higher energy level to a lower energy level. The energy of the photon is the exact energy that is lost by the electron moving to its lower energy level.
Hope this helps!
A 1250.0g block of silver at 1oC is placed in 2.6g of water vapor at 102oC. What is the equilibrium temperature of the two substances? Specific Heat of Ag is 0.235J/goC
Please answer with work shown
Answer:
Explanation:
Let final temperature be T .
vapor is at 102⁰C
loss of heat by vapor in turning into water at 100⁰C
= 2.6 x 2 x 1.996 + 2.6 x 2260 = 5886.37 J
loss of heat to lower temperature to T
2.6 x 4.186 x ( 100 - T )
1088.36 - 10.88 T
Total heat loss = 5886.37 + 1088.36 - 10.88 T
= 6974.73 - 10.88 T
heat gain by silver to gain temperature from 1⁰C to T⁰C
= 1250 x ( T - 1 ) x .235 = 293.75 T - 293.75
heat gain = heat loss
293.75 T - 293.75 = 6974.73 - 10.88 T
304.63 T = 7268.48
T = 23.86°C .
⚠️NEED HELP ASAP⚠️What is the oxidation number of nitrogen in (NO3)2
A) +3
B) +1
C+5
D) -5
Explanation:
its +5 trust me on this hope this helps kiddo
please helppp this is about to be due
Answer:
38
Explanation:
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.
In given question atomic number is 38 which means number of proton and number of electrons are also 38 because number of protons are electrons are always equal in neutral atom.
a.
A una atmósfera de presión (1atm), ¿cuál es el punto de solidificación del agua?
Answer:
ajansnnddndjsjjenrndndndndndndndnd
please need asap
An atom with 38 protons and 49 neutrons would be
Strontium-49
Francium-49
Strontium-87
Francium-87
Answer:
i think it is francium 87 if i fail then i am sorry
what is the difference between a galvanic cell and an electrolytic cell? APEX
Answer:
A. A galvanic cell generates electrical current, and an electrolytic cell uses electrical energy to cause redox reactions to occur.
Explanation:
A galvanic cell produces electrical energy through the conversion of chemical energy whereas the electrolytic cell carries out the conversion of the electrical energy/current supplied to it into chemical energy. The reaction that takes place in the galvanic cell is spontaneous which is responsible for the electrical energy that is produced. The redox reaction in the electrolytic cell is not spontaneous. Electrical energy has to be supplied to it in order to initiate the reaction.
Balance the following chemical equations
Answer:
1) 3Fe + 2O(2, this is the subscript) - Fe(3)O(4)
2) 2Sr + O(2) - 2SrO
3) Sn + 2NaOH - Na(2)SnO(2) + H(2)
4) 2K + Br(2) -2KBr
5) 2C(8)H(18) + 25O(2) - 16CO(2) + 18H(2)O
How do spores help the survival of spore-bearing plant?
Answer:
When weather conditions are ideal, some ferns, algae, moss,and even fungi, release spores into the air, often carried by the wind, by insects or birds until they land. Spores contain both male and female reproductive organs, which allows these plants to replicate themselves in a form of cloning.
Explanation:
A balloon has a volume of 125mL with 10 pumps of gas. The balloon is reduced in volume to 88mL, how much gas is in the balloon?
Answer:
7.04
Explanation:
i think
When copper is bombarded with high-energy electrons, X rays are emitted. Calculate the energy (in joules) associated with the photons if the wavelength of the X rays is 0.154 nm.
Answer:
E = 12.92 × 10^(-16) J
Explanation:
Formula for energy is;
E = hc/λ
Where;
h is Planck's constant = 6.63 x 10^(-34) J.s
c is speed of light = 3 × 10^(8) m/s
λ is wavelength = 0.154 nm = 0.154 × 10^(-9) m
E = (6.63 x 10^(-34) × 3 × 10^(8))/(0.154 × 10^(-9))
E = 12.92 × 10^(-16) J
The energy associated with the photons of X rays with a wavelength of 0.154 nm is 1.29 × 10⁻¹⁵ J.
When copper is bombarded with high-energy electrons, X rays, with a wavelength of 0.154 nm (λ) are emitted.
We can calculate the energy (E) associated with the photons of these X rays using the Planck-Einstein relation.
[tex]E = \frac{h \times c }{\lambda } = \frac{(6.63 \times 10^{-34}J.s ) \times (3.00 \times 10^{8}m/s ) }{0.154 \times 10^{-9} m } ]= 1.29 \times 10^{-15} J[/tex]
where,
h: Planck's constantc: speed of lightThe energy associated with the photons of X rays with a wavelength of 0.154 nm is 1.29 × 10⁻¹⁵ J.
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Burning 1 kg of coal releases about 3 million joules of energy. If you could use all of the chemical energy to lift another kilogram of coal, how high could you lift it?
I could lift 3.06 x 10⁵ m high
Further explanationEnergy is the ability to do work. Energy can change from one energy to another
Potential energy is the energy that an object has because of its position
The potential energy can be formulated:
Ep = m. g. h
E = potential energy of an object, joule
m = object mass, kg
g = gravity acceleration, m / s²
h = height of an object, m
energy of coal = 3.10⁶ J
mass = 1 kg
g = 9.8 m/s²
[tex]\tt h=\dfrac{E}{m.g}\\\\h=\dfrac{3.10^6}{1\times 9.8}=3.06\times 10^5`m[/tex]
the amount of carbWhat is your carbon footprint?
the amount of carbon dioxide you use when recycling
the amount of oxygen put into the atmosphere due to your consumption of fossil fuels
the amount of carbon dioxide and oxygen in the atmosphere at any given time
the amount of carbon dioxide put into the atmosphere due to your consumption of fossil fuelson dioxide put into the atmosphere due to y
Answer:
D
Explanation:
How many atoms are there in 10.2 moles of Phosphorous?
There are 2.06 x 10²⁴ atoms
Further explanationThe mole is the number of particles (atoms, molecules, ions)contained in a substance
1 mol = 6.02.10²³ particles
Moles can also be determined from the amount of substance mass and its molar mass
number of atoms :
[tex]\tt 10.2\times 6.02\times 106{23}=2.06\times 10^{24}[/tex]
Question 3 (1 point)
Which of the following best explains the scenario below?
On a summer morning, Mrs. Houser walks barefoot across her paved driveway with
no problem. However, later that afternoon she steps barefoot onto the same
driveway and must quickly run off because the bottoms of her feet feel like they are
burning. (Lesson 3.02-3.04 Thermal Energy)
Choose the best explanation for this scenario:
As the temperature increased
during the day, the particles in the pavement
moved slower and the thermal energy decreased.
As the temperature increased during the day, the particles in the pavement
moved faster and the thermal energy decreased.
As the temperature increased during the day, the particles in the pavement
moved faster and the thermal energy increased.
As the temperature increased during the day, the particles in the pavement
moved slower and the thermal energy increased.
Pls help ASAP
Answer:
C. As the temperature increased during the day, the particles in the pavement moved faster and the thermal energy increased.
Explanation:
During the day, the temperature increases and the average kinetic energy of its particles increases. With the increase in kinetic energy, particles start vibrating faster that occupies more space. This increased molecular motion results in the generation of more thermal energy.
Therefore, the thermal energy of an object increases as its temperature increases.
Hence, the correct answer is "C."
Answer: Hello. the correct answer is Option C. As the temperature increased during the day, the particles in the pavement moved faster and the thermal energy increased.
Explanation:
I Took the K12 Online School Quiz.
I will give brainliest !
Which of the following is NOT an example of how biotic factors interact with abiotic factors in an ecosystem?
A) Plants remove carbon dioxide from the air and add oxygen.
B) Animals cause erosion by digging in the dirt.
C) A lion preys on a herd of gazelle.
D) A lizard raises its body temperature by using heat from the Sun.
Answer:
C
Explanation:
I had the same answer during school and the teacher said it was correct but if it isnt I'm super sorry
A lion preying on a herd of gazelle is not an example of how biotic factors interact with abiotic factors in an ecosystem.
What is an ecosystem?
Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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Which of the following land- forms is the result of wind depo- sition? a. deflation hollow b. desert pavement c. dune d. abrasion
Answer:
Coastal regions are often affected by abrasion. What process would cause increased abrasion along a costalregion? Abrasion is physical weathering caused by water, wind and gravity. The coastal regions areaffected by abrasion due to large volumes of water and increasedwinds.
Explanation:
I I hope this answer is Wright
What is involved in weathering?
Answer:
the answer is water.Hope this helps
A substance absorbed 895 J and caused its temperature to increase by 10 ºC. If the substance has a mass of 27.9 g, what is the substance's specific heat in J/(gºC) ?
1.) 3.21
2.) 4.62
3.) 1,406.25
4.) 249,705
Answer:
i dont get the equation sorry wish i can help
How many molecules are there in 0.5 moles of C2H6?
Answer:
3
Explanation:
___________ elements are naturally unstable as they break down over time to more stable forms.
Answer:
Radioactive elements
Explanation:
why neon has zero valency?
Answer:
hope it helps you
Explanation:
Helium has two electrons in its energy shell, while argon and neon have 8 electrons in their valence shells. As these have maximum number of electrons in their valence shells, they do not have any tendency to combine with other elements. Hence, they have a valency equal to zero.
Two atoms in the same molecule are linked together by a
chemical ______
Answer: Chemical bond. Two atoms in the same molecule are linked together by a chemical bond. Write "bond" in the blank.
Two atoms in the same molecule are linked together by a chemical bond.
What is chemical bond ?A chemical bond is defined as the formation of a chemical compound by the union of two or multiple atoms, ions, or molecules, the firmness can be evaluated by the type of its chemical bond.
Ionic Bond is a type of chemical bond where relocation of electrons from one atom to alternative atom, one atom creates a negative charge called as anion while another atom creates a positive charge called cation.
The covalent bond defines the distribution of electrons among atoms, it can be either polar or non polar in nature and the electrons are united unevenly in polar covalent chemical bonding.
Hydrogen Bonding is a fragile procedure of chemical bonding, this type of polar covalent bonding occur between oxygen and hydrogen where hydrogen develops a partial positive charge in the formation of the water.
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A 32.149 mg sample of a chemical known to contain only carbon hydrogen sulfur and oxygen is put into a combustion analysis apparatus yielding 57.271 mg of co2 and 23.444 mg of h2o. In another experiment 22.345 mg of the compound is reacted with excess oxygen to produce 9.656 mg of sulfur dioxide
Answer:
C₅H₁₀SO₂
Explanation:
From the given information:
The objective is to identify the empirical formula of the compound.
To start with determining the mass of carbon from carbon dioxide; we have:
[tex]Mass \ of \ Carbon = \dfrac{molar \ mass \ of \ C }{molar \ mass \ of \ CO_2}\times mass \ of \ CO_2[/tex]
Mass of carbon = 12/44 × 57.271 mg
Mass of carbon = 0.2727 × 57.271 mg
Mass of carbon = 15.6178 mg
The mass of hydrogen is:
[tex]Mass \ of \ Hydrogen= \dfrac{molar \ mass \ of \ H }{molar \ mass \ of \ H_2O}\times mass \ of \ H_2O[/tex]
[tex]Mass \ of \ Hydrogen= \dfrac{2\times 1.008 }{18}\times 23.444 \ mg[/tex]
Mass of hydrogen = 2.6257 mg
The mass of sulphur is:
[tex]Mass \ of \ Sulphur = \dfrac{molar \ mass \ of \ S }{molar \ mass \ of \ SO_2}\times mass \ of \ SO_2[/tex]
Mass of Sulphur = [tex]\dfrac{32.07}{64.06} \times \dfrac{9.656}{1} \times \dfrac{32.149}{ 22.345}[/tex]
Mass of Sulphur = 6.9550 mg
The Mass of oxygen can now be = mass of (Sample - Carbon - Hydrogen - Sulphur)
= (32.149 - 15.6178 - 2.6257 - 6.9550)g
= 6.9505 g
Recall that:
number of moles = mass/molar mass
Thus:
The moles of C : H : S : O are:
[tex]= \dfrac{15.6178}{12} : \dfrac{2.6257}{1.008} : \dfrac{6.9550}{32.07} : \dfrac{6.9505}{16}[/tex]
= 1 : 2 : 0.2 : 0.4
Divide by the smallest; we have:
= 1/0.2 : 2/0.2 : 0.2/0.2 : 0.4/0.2
= 5 : 10 : 1 : 2
Thus, the empirical formula is = C₅H₁₀SO₂
Which example illustrates a chemical change
shredding paper
smashing a soda can
burning wood
chopping wood
Please help!! I don’t know how to do this I need help ASAP
Answer:
Explanation:
how to convert 12g of nitrogen gas in mole
Answer:
it takes more than 12g of nitrogen gas to make a mole
Answer:
0.86 mol N
Explanation:
To convert between grams and moles, you need the molar mass of the substance. The molar mass of nitrogen is 14.01g/mol. This is used as the unit converter.
[tex]12gN*\frac{1molN}{14.01gN} = 0.85653 mol N[/tex]
Then round the answer to the lowest number of significant figures = 0.86 mol N.
7th GRADE SCIENCE FIRDT PERSON MARKED BRAINLIEST
A generator is used to convert ________ energy into ______ energy
Answer:
An electricity generator is a device that converts a form of energy into electricity.
Answer:
mechanical to electrical
Explanation:
The diagrams below represent three phases of matter labeled A,B and C. Which table correctly identifies the phases of matter represented by the diagrams? *
Answer:
The correct answer is 1
Explanation:
From the above, we will note the following:
Diagram A is liquid because it takes the shape of its container and it also has a specific volume. The particles are not tightly packed.
Diagram B is gas because the particles are freely moving colliding with one another and with walls of the container.
Diagram C is solid because the particles are tightly packed and are not freely moving.
Therefore, Option 1 is the correct answer.
Answer: 1
Explanation: My professor said it was correct
how long does it take to find out that you just want to stuff your face in chocolate
Answer:
no to long
Explanation:
thanks for the points
please help if you can. thank you.
Answer:
[tex]a. BaF_{2} \\b. SnCl_{4}\\ c.Cr_{2} O_{3} \\d. FeO\\e. Li_{3} P[/tex]
Explanation:
Hey, just for a quick tip..you can use a cross to determine which ion will have how many atoms. check the image attached.
